Help with server premissions.

Hi, I own a private server for me and my freinds, but i don't want to op them, because they can be a bit anoying sometimes (they like lava :) but if i don't they can't talk or intaract with anything, which really sucks, so could someone please help me. Cheers, Tim-Tam-Attack.

By the way, here's my premission list (i use group manager and i use the default settings, with one exeption where i tried to fix this my self.)

groups:
Default:
default: true
permissions:
- -bukkit.command.kill
inheritance:
- g:groupmanager_default
- g:bukkit_default
- g:essentials_default
- g:modifyworld.*
info:
prefix: '&a[Noob] &f'
build: false
suffix: ''
Builder:
default: false
permissions: []
inheritance:
- Default
- g:essentials_builder
info:
prefix: '&e[Loacal] &f'
build: true
suffix: ''
Moderator:
default: false
permissions: []
inheritance:
- Builder
- g:groupmanager_moderator
- g:bukkit_moderator
- g:essentials_moderator
- g:towny_moderator
- g:vanish_moderator
info:
prefix: ' &9[Moderator] &f'
build: true
suffix: ''
Admin:
default: false
permissions: []
inheritance:
- Moderator
- g:groupmanager_admin
- g:bukkit_admin
- g:essentials_admin
- g:towny_admin
- g:vanish_admin
info:
prefix: '&c[Admin] &f'
build: true
suffix: ''
Owner:
default: false
permissions:
- '*'
- -vanish.*
inheritance:
- Admin
info:
prefix: ' &0&o[&4&oOwner&0&o] &f&o'
build: true
suffix: ''